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Manlytears said:

Question.

Did GKC ban of copied cards get solved?
I heard the used game marked is kinda dangerous. You really need to trust the seller.

The copied cards problem never had anything to do with GKC. It happened with Switch 1 games twice as far as I am aware and both cases were solved by people providing Nintendo evidence that they bought the game used. Just buy it from a store and get your receipts. If you buy from someone personally and pay in cash without any prove, this may become a bigger problem.
And the used market for the Nintendo games is huge, the chance of this happening to you is less than a rounding error.